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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Hot deformation mechanism and microstructure evolution of TC11 titanium alloy in field
CHEN Hui-qin(陈慧琴)1, 2, CAO Chun-xiao(曹春晓)1, GUO Ling(郭 灵)1, LIN Hai(林 海)1

1. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. School of Materials Science and Engineering, Taiyuan University of Science and Technology,Taiyuan 030024, China

Abstract:Hot deformation behaviors of TC11 alloy with -annealed lamellar structure and forged equiaxed structure were investigated in the  field in the temperature range of 1 090−1 030 ℃ and strain rate of 0.001−0.1 s−1 by means of isothermal compression tests. Hot deformation characteristics and microstructure evolutions of the two starting structures were analyzed. And hot processing power dissipation efficiency maps were established. EBSD technique was used for testing grain boundary characteristic of deformation structures. The results indicate that hot deformation mechanism of TC11 alloy in  field is dynamic recovery accompanied by geometric dynamic recrystallization at large strains, or discontinuous dynamic recrystallization based on the starting structure states and deformation parameters. Accordingly, there are two different grain refining patterns. One is characteristic of new fine grains in the interior of elongated prior  grains that have serrated grain boundaries; and the other is that of new fine grains along elongated prior  grain boundaries.

 

Key words: TC11 titanium alloy; hot deformation; microstructure evolution

ISSN 1672-7029
CN 43-1423/U

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